N.J. Stat. § 54:4-3.113d
The local enforcing agency, when requested for a certification pursuant to this act, shall certify a system as being a renewable energy system whenever the local enforcing agency finds that the system installed was designed primarily as a renewable energy system in accordance with rules and regulations adopted by the commissioner pursuant to subsection b. of section 7 of this act. The certificate shall contain information identifying the renewable energy system and the cost thereof and shall be in such form and detail as the director shall prescribe. The certificate shall be provided to the applicant therefor, with a copy retained on file by the local enforcing agency, and a copy of the certificate shall be sent to the assessor of the taxing district in which the property containing the renewable energy system is located and has been installed. The exemption from taxation for the renewable energy system shall become effective for the tax year following the year in which certification has been granted and thereafter during its use primarily for such purposes.
N.J.S. § 54:4-3.113d